package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.File;
import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车业务实现
 *
 * @Author itcast
 * @Create 2023/4/28
 **/
@Service
@Slf4j
public class ShoppingCartServicelmpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 将商品添加到购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //对象属性拷贝
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());  // getCurrentId获取当前id
        //查询当前商品是否在购物车中 select * from shopping_cart where user_id = ? and setmeal_id = ?
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0){
            //如果存在,就修改数量,加1
            shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else{
            //如果不存在,就插入一条数据,数量设为1
            //获取当前添加进来的是菜品 还是 套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //添加进来的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //添加进来的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCart.setNumber(1);
            shoppingCartMapper.insert(shoppingCart);

        }
    }

    /**
     * 查看当前微信用户的购物车商品
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart
                .builder()
                .userId(BaseContext.getCurrentId())
                .build());
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        if (shoppingCarts != null && shoppingCarts.size() == 1) {
            shoppingCart = shoppingCarts.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() - 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
            Long dishId = shoppingCart.getDishId();
            if (dishId != null) {
                if (shoppingCart.getNumber() == 0) {
                    shoppingCartMapper.subByDishId(shoppingCart.getDishId());
                }
            } else {
                if (shoppingCart.getNumber() == 0) {
                    shoppingCartMapper.subBySetmealId(shoppingCart.getSetmealId());
                }
            }
        }
    }
}
